6649385 has 8 divisors (see below), whose sum is σ = 8009736. Its totient is φ = 5299200.

The previous prime is 6649367. The next prime is 6649387. The reversal of 6649385 is 5839466.

It can be written as a sum of positive squares in 4 ways, for example, as 218089 + 6431296 = 467^2 + 2536^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6649385 - 2¹⁴ = 6633001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6649387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1016 + ... + 3785.

It is an arithmetic number, because the mean of its divisors is an integer number (1001217).

Almost surely, 2^6649385 is an apocalyptic number.

It is an amenable number.

6649385 is a deficient number, since it is larger than the sum of its proper divisors (1360351).

6649385 is a wasteful number, since it uses less digits than its factorization.

6649385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5083.

The product of its digits is 155520, while the sum is 41.

The square root of 6649385 is about 2578.6401455031. The cubic root of 6649385 is about 188.0444383407.

The spelling of 6649385 in words is "six million, six hundred forty-nine thousand, three hundred eighty-five".